The Tower had five underground levels. All of them had restricted access. Only members of the Droid Council and some select bots like Microbot 1047 were allowed access. The access to all levels was controlled by a central Maglev lift operated by circuit identification.
The first level contained the CRF. The next level was the Robot Manufacturing Facility (RMF). The third level was the location of the Energy Core. The fourth level was the crypt where the bodies of the dead humans were kept. The fifth and lowest level was the Tunnel Room, which contained ten arterial underground tunnels, of which after nearly 10 years, one was occupied.